Dynamic pore-network modeling of air-water flow through thin porous layers

Chao Zhong Qin, Bo Guo, Michael Celia, Rui Wu

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Thin porous layers, that have large aspect ratios, are seen in many applications such as hydrogen fuel cells and hygiene products, in which air-water immiscible flow is of great interest. Direct numerical simulations based on Navier-Stokes equation are computationally expensive, and even prohibitive for low capillary number flow such as water flooding in low-temperature polymer electrolyte fuel cells. Alternatively, the pore-network modeling needs much less computational resources, while still retaining essentials of the pore-structure information. In this work, a dynamic pore-network model of air-water flow with phase change has been developed. We focus on drainage processes through thin porous layers, in which liquid water is the nonwetting phase. Three test cases are conducted, namely, air-water flow through a thin porous layer, air-water flow through a bilayer of fine and coarse thin porous layers, and water flooding in the gas diffusion layer of a polymer electrolyte fuel cell with phase change between water and its vapor. Using these test cases, we aim to demonstrate the application of dynamic pore-network modeling in thin porous media studies. In particular, we discuss the challenge of modeling thin porous media at the average scale, and highlight the role of phase change in removing liquid water from the cathode gas diffusion layer.

Original languageEnglish (US)
Pages (from-to)194-207
Number of pages14
JournalChemical Engineering Science
Volume202
DOIs
StatePublished - Jul 20 2019

Fingerprint

Water
Air
Fuel cells
Diffusion in gases
Electrolytes
Porous materials
Polymers
Hydrogen fuels
Steam
Direct numerical simulation
Liquids
Pore structure
Navier Stokes equations
Drainage
Aspect ratio
Cathodes
Vapors
Temperature

Keywords

  • Phase change
  • polymer electrolyte fuel cell (PEFC)
  • Pore-network modeling
  • Thin porous media
  • Two-phase flow
  • Water and heat management

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Cite this

Dynamic pore-network modeling of air-water flow through thin porous layers. / Qin, Chao Zhong; Guo, Bo; Celia, Michael; Wu, Rui.

In: Chemical Engineering Science, Vol. 202, 20.07.2019, p. 194-207.

Research output: Contribution to journalArticle

Qin, Chao Zhong ; Guo, Bo ; Celia, Michael ; Wu, Rui. / Dynamic pore-network modeling of air-water flow through thin porous layers. In: Chemical Engineering Science. 2019 ; Vol. 202. pp. 194-207.
@article{1a8605c6d04e4edbb6dd4b255ec840ee,
title = "Dynamic pore-network modeling of air-water flow through thin porous layers",
abstract = "Thin porous layers, that have large aspect ratios, are seen in many applications such as hydrogen fuel cells and hygiene products, in which air-water immiscible flow is of great interest. Direct numerical simulations based on Navier-Stokes equation are computationally expensive, and even prohibitive for low capillary number flow such as water flooding in low-temperature polymer electrolyte fuel cells. Alternatively, the pore-network modeling needs much less computational resources, while still retaining essentials of the pore-structure information. In this work, a dynamic pore-network model of air-water flow with phase change has been developed. We focus on drainage processes through thin porous layers, in which liquid water is the nonwetting phase. Three test cases are conducted, namely, air-water flow through a thin porous layer, air-water flow through a bilayer of fine and coarse thin porous layers, and water flooding in the gas diffusion layer of a polymer electrolyte fuel cell with phase change between water and its vapor. Using these test cases, we aim to demonstrate the application of dynamic pore-network modeling in thin porous media studies. In particular, we discuss the challenge of modeling thin porous media at the average scale, and highlight the role of phase change in removing liquid water from the cathode gas diffusion layer.",
keywords = "Phase change, polymer electrolyte fuel cell (PEFC), Pore-network modeling, Thin porous media, Two-phase flow, Water and heat management",
author = "Qin, {Chao Zhong} and Bo Guo and Michael Celia and Rui Wu",
year = "2019",
month = "7",
day = "20",
doi = "10.1016/j.ces.2019.03.038",
language = "English (US)",
volume = "202",
pages = "194--207",
journal = "Chemical Engineering Science",
issn = "0009-2509",
publisher = "Elsevier BV",

}

TY - JOUR

T1 - Dynamic pore-network modeling of air-water flow through thin porous layers

AU - Qin, Chao Zhong

AU - Guo, Bo

AU - Celia, Michael

AU - Wu, Rui

PY - 2019/7/20

Y1 - 2019/7/20

N2 - Thin porous layers, that have large aspect ratios, are seen in many applications such as hydrogen fuel cells and hygiene products, in which air-water immiscible flow is of great interest. Direct numerical simulations based on Navier-Stokes equation are computationally expensive, and even prohibitive for low capillary number flow such as water flooding in low-temperature polymer electrolyte fuel cells. Alternatively, the pore-network modeling needs much less computational resources, while still retaining essentials of the pore-structure information. In this work, a dynamic pore-network model of air-water flow with phase change has been developed. We focus on drainage processes through thin porous layers, in which liquid water is the nonwetting phase. Three test cases are conducted, namely, air-water flow through a thin porous layer, air-water flow through a bilayer of fine and coarse thin porous layers, and water flooding in the gas diffusion layer of a polymer electrolyte fuel cell with phase change between water and its vapor. Using these test cases, we aim to demonstrate the application of dynamic pore-network modeling in thin porous media studies. In particular, we discuss the challenge of modeling thin porous media at the average scale, and highlight the role of phase change in removing liquid water from the cathode gas diffusion layer.

AB - Thin porous layers, that have large aspect ratios, are seen in many applications such as hydrogen fuel cells and hygiene products, in which air-water immiscible flow is of great interest. Direct numerical simulations based on Navier-Stokes equation are computationally expensive, and even prohibitive for low capillary number flow such as water flooding in low-temperature polymer electrolyte fuel cells. Alternatively, the pore-network modeling needs much less computational resources, while still retaining essentials of the pore-structure information. In this work, a dynamic pore-network model of air-water flow with phase change has been developed. We focus on drainage processes through thin porous layers, in which liquid water is the nonwetting phase. Three test cases are conducted, namely, air-water flow through a thin porous layer, air-water flow through a bilayer of fine and coarse thin porous layers, and water flooding in the gas diffusion layer of a polymer electrolyte fuel cell with phase change between water and its vapor. Using these test cases, we aim to demonstrate the application of dynamic pore-network modeling in thin porous media studies. In particular, we discuss the challenge of modeling thin porous media at the average scale, and highlight the role of phase change in removing liquid water from the cathode gas diffusion layer.

KW - Phase change

KW - polymer electrolyte fuel cell (PEFC)

KW - Pore-network modeling

KW - Thin porous media

KW - Two-phase flow

KW - Water and heat management

UR - http://www.scopus.com/inward/record.url?scp=85063196192&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85063196192&partnerID=8YFLogxK

U2 - 10.1016/j.ces.2019.03.038

DO - 10.1016/j.ces.2019.03.038

M3 - Article

AN - SCOPUS:85063196192

VL - 202

SP - 194

EP - 207

JO - Chemical Engineering Science

JF - Chemical Engineering Science

SN - 0009-2509

ER -